A man with a very small penis who does everything he can to hide it.
Pazer Lenis is a "play on words" derived from the phrase Lazer Penis. It is a type of wordplay that is defined as Spoonerism. A man who has a penis "as small as a beam of light" is a Pazer Lenis when he hides it by driving the biggest fucking truck you've ever seen in your life.
Dude, our 45th president is such a Pazer Lenis! Did you see how small his hands are?!?